All they have to do is go back home where public college is free and very heavily subsidized by their government. What entitles them to ignore laws regarding foreign students and student visas and the whole bit? Let them go take their place in the same line everyone else has to be in, if they don't have the money to be a foreign student in the USA, then they can study in Mexico. If they have the money, then get a student visa like the law-abiders most do and pay the higher rates.